I'm not aware of a way of doing this but, you can certainly add the design properties on the highest possible lever for your template under /etc/designs/..
If you set the allowed components like
components / String[] / = group:MyComponents
for your template node in /crx/de you don't have to define this further down in the hierarchy for other parsys in that template. Might not be exactly what you are after but might help you in some way :)
Regards
JOhan